CN217176737U - Two-stage injection urea metering pump - Google Patents
Two-stage injection urea metering pump Download PDFInfo
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- CN217176737U CN217176737U CN202220385900.2U CN202220385900U CN217176737U CN 217176737 U CN217176737 U CN 217176737U CN 202220385900 U CN202220385900 U CN 202220385900U CN 217176737 U CN217176737 U CN 217176737U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The utility model relates to a two-stage injection urea metering pump, including the gas circuit system, the gas circuit system provides compressed air and assists urea injection, is provided with the feed liquor filter screen, and the feed liquor filter screen links to each other with first urea pumping system, and first urea pumping system links to each other with first injection unit, and two-stage injection urea metering pump still is provided with second urea pumping system, second urea pumping system links to each other with second injection unit, second urea pumping system is parallelly connected with first urea pumping system, in the assembly of two injection urea metering pumps, has integrated two sets of independent pumping systems, has realized high integration, has reduced the cost by a wide margin, has reduced the system control degree of difficulty, has reduced the fault rate, has still avoided the waste of material simultaneously; each stage in the double-injection can reach the injection precision required by the tail gas post-treatment system, and the two paths are independent to each other, so that the tail gas post-treatment system can adjust the two-stage urea injection amount at will under complex industrial control.
Description
Technical Field
The utility model relates to a diesel engine tail gas treatment field especially relates to a doublestage sprays urea measuring pump.
Background
With the gradual upgrade of the emission standard, the emission limit of the national seven emission standard for NOx will be greatly reduced compared with the national six emission standard, and the single-stage SCR system mainly responsible for treating NOx in the current exhaust gas after-treatment system cannot meet the limit of the national seven emission standard for NOx emission. Experiments of various domestic relevant manufacturers show that two levels of SCR systems are needed to meet the national emission standard, each level of SCR system needs to correspond to one urea injection unit, namely two urea injection units are needed, the two urea injection units need to work independently, and each injection unit needs to have extremely high injection precision.
Two solutions are currently generally adopted: firstly, two single injection urea pumps are directly arranged on a vehicle, the scheme can achieve the required effect, but the cost is multiplied, and serious waste is caused; secondly, a single-injection urea pump divides one path of urea injection unit into two paths of urea injection units outside the pump through a valve, and the unit is as follows: CN202110891201.5, patent name: the invention discloses a urea supply injection system with a double-stage injection function, which seems to realize double-stage urea injection, but cannot meet the requirement perfectly. The first reason is as follows: the two urea injection units cannot be mutually independent and need to be injected simultaneously; the second reason is that: the injection quantity of the second path of urea injection unit is the difference value between the total urea injection quantity and the injection quantity of the first path of urea injection unit, but the current technology has no method for accurately controlling the injection quantity of the first path of urea injection unit at low cost, so that the two paths of injection quantities have no precision, and therefore, the scheme cannot ensure that the two paths of injection precision meet the requirements of national emission standards.
In summary, the two-stage urea injection metering pump used in the current market needs two urea injection units, and has the disadvantages of high system control difficulty, high failure rate, high cost, poor injection quantity precision and incapability of meeting the requirements of the emission standard of the seventh national standard.
Disclosure of Invention
The urea metering pump aims at solving the problems that a double-stage injection urea metering pump used in the current market needs two urea injection units, the system control difficulty is high, the failure rate is high, the cost is high, the injection quantity precision is poor, and the national emission standard requirement cannot be met.
The embodiment of the application provides a urea measuring pump is sprayed to doublestage, including the gas circuit system, the gas circuit system provides the supplementary urea of compressed air and sprays, is provided with the feed liquor filter screen, the feed liquor filter screen links to each other with first urea pumping system, first urea pumping system links to each other with first injection unit, still is provided with second urea pumping system, second urea pumping system links to each other with the second injection unit, second urea pumping system is parallelly connected with first urea pumping system in parallel, second urea pumping system is the same with first urea pumping system structure.
In one embodiment, the first urea pumping system comprises a first bidirectional liquid pump, a first driving motor, a first liquid outlet filter screen and a first pressure sensor, wherein the first bidirectional liquid pump is connected with the first driving motor.
In one embodiment, the second urea pumping system comprises a second bidirectional liquid pump, a second driving motor, a second liquid outlet filter screen and a second pressure sensor, and the second bidirectional liquid pump is connected with the second driving motor.
In one embodiment, the air path system comprises an air inlet filter screen, a first normally closed solenoid valve, a pressure reducing valve and a second normally closed solenoid valve, wherein the air inlet filter screen, the first normally closed solenoid valve and the pressure reducing valve are sequentially arranged on a pipeline of the air path system, the pressure reducing valve is connected with the first external mixed urea injection unit, the second normally closed solenoid valve is connected with the first external mixed urea injection unit in parallel, and the second normally closed solenoid valve is connected with the second external mixed urea injection unit.
In one embodiment, the system is further provided with a first mixing cavity and a second mixing cavity, the first mixing cavity is respectively connected with the first urea pumping system, the gas circuit system and the first premixed urea injection unit, and the second mixing cavity is respectively connected with the second urea pumping system, the gas circuit system and the second premixed urea injection unit.
In one embodiment, the first urea pumping system comprises a first one-way liquid pump, a first driving motor, a first one-way valve and a first pressure sensor, wherein the first one-way liquid pump is connected with the first driving motor.
In one embodiment, the second urea pumping system comprises a second one-way liquid pump, a second driving motor, a second one-way valve and a second pressure sensor, and the second one-way liquid pump is connected with the second driving motor.
In one embodiment, the gas circuit system comprises an air inlet filter screen, a first normally closed solenoid valve, a pressure reducing valve, a second normally closed solenoid valve and an integrated electromagnetic directional valve, wherein the second normally closed solenoid valve is connected with the integrated electromagnetic directional valve in parallel, the integrated electromagnetic directional valve is respectively connected with a first urea pumping system, a second urea pumping system and a first external mixed urea injection unit, and the second normally closed solenoid valve is connected with the first external mixed urea injection unit.
The beneficial effects of the utility model reside in that:
the utility model relates to a two-stage injection urea metering pump, including the gas circuit system, the gas circuit system provides compressed air and assists urea injection, is provided with the feed liquor filter screen, and the feed liquor filter screen links to each other with first urea pumping system, first urea pumping system links to each other with first injection unit, and two-stage injection urea metering pump still is provided with second urea pumping system, second urea pumping system links to each other with second injection unit, second urea pumping system is parallelly connected with first urea pumping system, in the assembly of two injection urea metering pumps, has integrated two sets of independent pumping systems, has realized high integration, has reduced the cost by a wide margin, has reduced the system control degree of difficulty, has reduced the fault rate, has still avoided the waste of material simultaneously; the two independent pumping systems can ensure that each stage in the double-injection can reach the injection precision required by the tail gas post-treatment system, and the two independent pumping systems can meet the arbitrary control requirement of the tail gas post-treatment system under complicated industrial control, so that the two-stage urea injection amount can be arbitrarily adjusted without any limitation when a host factory debugs the tail gas post-treatment system of the two-stage SCR system.
Drawings
FIG. 1 is a schematic view of a first embodiment;
FIG. 2 is a schematic view of a second embodiment;
FIG. 3 is a schematic view of a third embodiment;
the symbols in the drawings illustrate that:
1. a urea tank;
20. feeding a liquid filter screen;
21. a first urea pumping system; 211. a first bi-directional liquid pump; 212. a first drive motor; 213. a first liquid outlet filter screen; 214. a first pressure sensor; 215. a first check valve; 216. a first one-way liquid pump;
22. a second urea pumping system; 221. a second bidirectional liquid pump; 222. a second drive motor; 223. a second liquid outlet filter screen; 224. a second pressure sensor; 225. a second check valve; 226. a second one-way liquid pump;
23. a gas path system; 231. an air inlet filter screen; 232. a first normally closed solenoid valve; 233. a pressure reducing valve; 234. a second normally closed solenoid valve; 235. an integrated electromagnetic directional valve;
241. a first mixing chamber; 242. a second mixing chamber;
3. a compressed air tank;
401. a first external-mixing urea injection unit; 402. a first premixed urea injection unit;
501. a second external-mixing urea injection unit; 502. a second premixed urea injection unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The first embodiment is as follows:
as shown in fig. 1, a two-stage injection urea metering pump comprises an air path system 23, the air path system 23 provides compressed air to assist urea injection, the air path system is provided with an inlet liquid filter screen 20, the inlet liquid filter screen 20 is connected with a first urea pumping system 21, the first urea pumping system 21 is connected with a first injection unit, the two-stage injection urea metering pump is further provided with a second urea pumping system 22, the second urea pumping system 22 is connected with a second injection unit, and the second urea pumping system 22 is connected with the first urea pumping system 21 in parallel.
The first urea pumping system 21 comprises a first bidirectional liquid pump 211, a first driving motor 212, a first liquid outlet filter screen 213 and a first pressure sensor 214, wherein the first bidirectional liquid pump 211 is connected with the first driving motor 212, and the first driving motor 212 drives the first bidirectional liquid pump 211 to operate so that urea passes through the liquid inlet filter screen 20, the first bidirectional liquid pump 211 and the first liquid outlet filter screen 213 from the urea tank 1 to the first external mixed urea injection unit 401 in sequence.
The second urea pumping system 22 comprises a second bidirectional liquid pump 221, a second driving motor 222, a second liquid outlet filter screen 223 and a second pressure sensor 224, the second bidirectional liquid pump 221 is connected with the second driving motor 222, the second driving motor 222 drives the second bidirectional liquid pump 221 to move, and urea passes through the liquid inlet filter screen 20, the second bidirectional liquid pump 221 and the second liquid outlet filter screen 223 in sequence from the urea tank 1 to the second external mixed urea injection unit 501.
Second urea pumping system 22 is identical in construction to first urea pumping system 21.
The air passage system 23 includes an air inlet screen 231, a first normally closed solenoid valve 232, a pressure reducing valve 233, and a second normally closed solenoid valve 234. The air channel system 23 is sequentially provided with an air inlet filter screen 231, a first normally closed solenoid valve 232 and a pressure reducing valve 233 on a pipeline, the pressure reducing valve 233 is connected with the first external mixed urea injection unit 401, the second normally closed solenoid valve 234 is connected with the first external mixed urea injection unit 401 in parallel, and the second normally closed solenoid valve 234 is connected with the second external mixed urea injection unit 501.
The first bidirectional liquid pump 211, the first driving motor 212, the first liquid outlet filter screen 213 and the first pressure sensor 214 together form a first urea pumping system 21; the second bidirectional liquid pump 221, the second driving motor 222, the second liquid outlet filter screen 223 and the second pressure sensor 224 together form the second urea pumping system 22. The first urea pumping system 21 and the second urea pumping system 22 are connected in parallel, and the liquid inlet pipelines of the first urea pumping system and the second urea pumping system are connected with the urea tank 1 through the liquid inlet filter 20, and the liquid outlet pipelines of the first urea pumping system and the second urea pumping system are respectively communicated with the first external-mixing urea injection unit 401 and the second external-mixing urea injection unit 501. When the first urea pumping system 21 injects urea, the first driving motor 212 drives the first bidirectional liquid pump 211 to suck urea and pump the urea, the urea enters the first bidirectional liquid pump 211 from the urea tank 1 through the liquid inlet filter 20, the urea is pressurized by the first bidirectional liquid pump 211, passes through the first liquid outlet filter 213, passes through the first pressure sensor 214, and sends pressure data to the system, and the urea is continuously filled into the first external mixed urea injection unit 401, and then metering injection is started. The operation of the second urea pumping system 22 is identical to that of the first urea pumping system 21 and will not be described in detail. When the first urea pumping system 21 performs urea injection operation, the operation state of the gas circuit is as follows: the first normally closed solenoid valve 232 is opened, the high-pressure compressed air stored in the compressed air tank 3 passes through the intake screen 231 and then enters the pressure reducing valve 233 through the opened first normally closed solenoid valve 232, and then in the pressure reducing valve 233, the high-pressure compressed air is reduced to a preset working pressure, which is called low-pressure compressed air, and the low-pressure compressed air enters the air passage of the first external-mixing urea injection unit 401 and is injected outwards to atomize the injected urea liquid. When the second urea pumping system 22 works, the working state of the gas circuit is as follows: the first normally closed solenoid valve 232 and the second normally closed solenoid valve 234 are opened, the high-pressure compressed air stored in the compressed air tank 3 passes through the air inlet filter screen 231 and then enters the pressure reducing valve 233 through the opened first normally closed solenoid valve 232, in the pressure reducing valve 233, the high-pressure compressed air is reduced to a preset working pressure, called low-pressure compressed air, and the low-pressure compressed air passes through the opened second normally closed solenoid valve 234 and enters an air passage of the second externally mixed urea spraying unit 501 and is sprayed outwards to atomize the sprayed urea solution.
Example two:
as shown in fig. 2, compared with the first embodiment, a first mixing chamber 241 and a second mixing chamber 242 are additionally provided, the first mixing chamber 241 is connected with a first urea pumping system 21 and an air path system 23, the second mixing chamber 242 is connected with a second urea pumping system 22 and the air path system 23, urea pumped by the first urea pumping system 21 is fully mixed by the first mixing chamber 241 with compressed air in the air path system 23 and then atomized and injected by an injection port of a first premixed urea injection unit 402, urea pumped by the second urea pumping system 22 is fully mixed by the second mixing chamber 242 with compressed air in the air path system 23 and then atomized and injected by an injection port of a second premixed urea injection unit 502.
When urea injection work is carried out, urea liquid pumped out by the first urea pumping system 21 and low-pressure compressed air passing through the pressure reducing valve 233 simultaneously enter the first mixing cavity 241, and after the urea liquid and the air are mixed, the gas-liquid mixture is atomized and injected at the injection port of the first premixed urea injection unit 402; the urea liquid pumped out by the second urea pumping system 22 and the low-pressure compressed air passing through the opened normally closed solenoid valve 234 enter the second mixing chamber 242 at the same time, and after the urea liquid and the air are mixed, the gas-liquid mixture is atomized and injected at the injection port of the second premixed urea injection unit 502.
Example three:
as shown in fig. 3, compared with the first embodiment, the first urea pumping system 21 includes a first one-way liquid pump 216, a first driving motor 212, a first one-way valve 215, and a first pressure sensor 214, where the first one-way liquid pump 215 is connected to the first driving motor 212, and the first driving motor 212 drives the first one-way liquid pump 216 to operate, so that urea from the urea tank 1 passes through the liquid inlet filter 20, the first one-way liquid pump 216, and the first one-way valve 215 in sequence, and reaches the first external-mixed urea injection unit 401.
The second urea pumping system 22 comprises a second one-way liquid pump 226, a second driving motor 222, a second one-way valve 225 and a second pressure sensor 224, the second one-way liquid pump 226 is connected with the second driving motor 222, and the second driving motor 222 drives the second one-way liquid pump 226 to act so that urea passes through the liquid inlet filter screen 20, the second one-way liquid pump 226 and the second one-way valve 225 from the urea tank 1 in sequence to reach the second external-mixing urea injection unit 501.
Compared with the gas circuit system in the first embodiment, the gas circuit system 23 is additionally provided with the integrated electromagnetic directional valve 235, the integrated electromagnetic directional valve 235 is connected with the second normally closed electromagnetic valve 234 in parallel, and the integrated electromagnetic directional valve 235 is connected with the first urea pumping system 21 and the second urea pumping system 22, so that residual urea liquid crystals in pipelines are mainly removed, and the pipelines are prevented from being blocked.
In addition to the operating condition of spraying urea, the urea supply and injection system also needs a so-called "purging" operating condition, i.e., a process of discharging urea solution in the pipeline, in order to avoid the urea solution remaining in the pipeline from crystallizing or solidifying in a low-temperature environment to block the pipeline. The pumping devices of the urea supply injection system schemes shown in the first embodiment and the second embodiment adopt a bidirectional liquid pump, so that the purging processes of the two schemes are the same, namely: the first driving motor 212 and the second driving motor 222 rotate reversely at the same time to respectively drive the first bidirectional liquid pump 211 and the second bidirectional liquid pump 221, the residual urea liquid in the pipeline flows back to the urea tank 1 from the first external mixed urea injection unit 401 and the second external mixed urea injection unit 501 respectively, and passes through the first liquid outlet filter screen 213 and the second liquid outlet filter screen 223 respectively in the process of flowing back the impurities possibly existing in the returned urea liquid from the exhaust pipe completely, so that the first bidirectional liquid pump 211 and the second bidirectional liquid pump 221 are prevented from being damaged, the two returned urea liquids are converged and then pass through the liquid inlet filter screen 20, and the two-stage fine filtration prevents the urea liquid in the urea tank 1 from being polluted. The purging operation of the urea supply injection system shown in the third embodiment is as follows: after the whole urea supply injection system stops working, the first normally closed electromagnetic valve 232 is opened, the electromagnetic directional valve 235 is reversed, high-pressure compressed air passes through the opened first normally closed electromagnetic valve 232 from the compressed air tank 3, the high-pressure compressed air is reduced to preset working pressure in the pressure reducing valve 233, the high-pressure compressed air is called low-pressure compressed air, the low-pressure compressed air is injected into the pipeline of the first urea pumping system 21 and the pipeline of the second urea pumping system 22 through the reversed electromagnetic directional valve 235, at the moment, the first check valve 215 and the second check valve 225 are in a closed state, and gas discharges urea liquid from a gas path access point to a position between the first external mixed urea injection unit 401 and the second external mixed urea injection unit 501 to an exhaust pipe to complete the 'purging' action.
Through a large amount of experimental accumulation and actual cost analysis, the technical scheme provided by the patent is not limited to the three embodiments, besides the three schemes, an electric heating module, a water circulation heating module, a temperature sensor, an independent air source and the like can be integrated in the double-injection urea metering pump, and the improvement of the technical personnel in the field through easy combination is in the protection scope of the patent.
Compared with the existing scheme that two single-injection urea pumps are mounted on one vehicle to realize two-stage SCR (corresponding to two-stage urea injection), the invention integrates two independent pumping systems in an assembly of a double-injection urea metering pump, thereby realizing high integration, greatly reducing the cost, reducing the control difficulty of the system, reducing the failure rate and avoiding the waste of materials.
Compare with the patent publication for CN202110891201.5, the utility model discloses can guarantee that each grade in the dual injection can both reach the injection precision of tail gas aftertreatment system demand, and two tunnel are independent mutually, can satisfy tail gas aftertreatment system arbitrary command demands under complicated industrial control, this enables the host computer factory when debugging two-stage SCR system's tail gas aftertreatment system, can adjust two-stage urea injection volume wantonly and do not receive any limitation. The advantages enable the tail gas after-treatment system using the technical scheme of the invention to completely meet the seven or even higher emission standards to be released.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (5)
1. A double-stage injection urea metering pump comprises a gas circuit system, wherein the gas circuit system provides compressed air for assisting urea injection, and is characterized in that a liquid inlet filter screen is arranged, the liquid inlet filter screen is connected with a first urea pumping system, the first urea pumping system is connected with a first injection unit, a second urea pumping system is further arranged, the second urea pumping system is connected with a second injection unit, the second urea pumping system is connected with the first urea pumping system in parallel, the first urea pumping system comprises a first bidirectional liquid pump, a first driving motor, a first liquid outlet filter screen and a first pressure sensor, the first bidirectional liquid pump is connected with the first driving motor, the second urea pumping system comprises a second bidirectional liquid pump, a second driving motor, a second liquid outlet filter screen and a second pressure sensor, the second bidirectional liquid pump is connected with the second driving motor, the urea spraying device is characterized by further comprising a first mixing cavity and a second mixing cavity, wherein the first mixing cavity is connected with the first urea pumping system, the gas circuit system and the first premixed urea spraying unit respectively, and the second mixing cavity is connected with the second urea pumping system, the gas circuit system and the second premixed urea spraying unit respectively.
2. The two-stage urea injection metering pump according to claim 1, wherein the gas path system comprises an air inlet filter screen, a first normally closed solenoid valve, a pressure reducing valve and a second normally closed solenoid valve, the air inlet filter screen, the first normally closed solenoid valve and the pressure reducing valve are sequentially arranged on a pipeline of the gas path system, the pressure reducing valve is connected with the first external mixed urea injection unit, the second normally closed solenoid valve is connected with the first external mixed urea injection unit in parallel, and the second normally closed solenoid valve is connected with the second external mixed urea injection unit.
3. The dual-stage urea injection metering pump of claim 1, wherein the first urea pumping system comprises a first one-way liquid pump, a first drive motor, a first one-way valve, and a first pressure sensor, and the first one-way liquid pump is connected to the first drive motor.
4. The dual-stage urea injection metering pump of claim 1, wherein the second urea pumping system comprises a second one-way liquid pump, a second driving motor, a second one-way valve and a second pressure sensor, and the second one-way liquid pump is connected with the second driving motor.
5. The two-stage urea injection metering pump according to claim 1, wherein the gas circuit system comprises an air inlet filter screen, a first normally closed solenoid valve, a pressure reducing valve, a second normally closed solenoid valve, and an integrated electromagnetic directional valve, the second normally closed solenoid valve is connected in parallel with the integrated electromagnetic directional valve, the integrated electromagnetic directional valve is respectively connected with the first urea pumping system, the second urea pumping system, and the first external-mixed urea injection unit, and the second normally closed solenoid valve is connected with the first external-mixed urea injection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220385900.2U CN217176737U (en) | 2022-02-24 | 2022-02-24 | Two-stage injection urea metering pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220385900.2U CN217176737U (en) | 2022-02-24 | 2022-02-24 | Two-stage injection urea metering pump |
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| Publication Number | Publication Date |
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| CN217176737U true CN217176737U (en) | 2022-08-12 |
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| CN202220385900.2U Active CN217176737U (en) | 2022-02-24 | 2022-02-24 | Two-stage injection urea metering pump |
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- 2022-02-24 CN CN202220385900.2U patent/CN217176737U/en active Active
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